to the stunning letter allegedly written from jail by former nfler aaron hernandez. In the letter, hernandez says he is innocent of the charges he faces. This is all part of god's plan for him. And abc's john muller is here with more on this. Reporter: The letter appears to be the first time hernandez has spoken out about the murder charges he is facing. In it, he not only says he's not guilty but that he's a great person with an amazing heart. Copies of this letter obtained by tmz and our sister network, espn, appear to show a man convinced of his innocence. I know everything happens for a reason, he writes. And I know god has a plan for me. And something good will come out of this. In the one-page handwritten letter, the former new england patriots tight end who pleaded not guilty, says he's been portrayed by friends, writing, the world just makes up things. And all the people who turned on me will feel like crap. I've always been a great person and known for having an amazing heart. I can't wait to sign this again when I'm playing again. Signing the letter and including his jersey number. It's hard to comprehend a date when aaron hernandez will be playing again in the nfl. Reporter: Overnight, hernandez's attorneys did not confirm a request that confirm the letter's authenticity. Abc news has learned it was written on paper hernandez had access to. And it was mailed in an envelope, from the correctional facility, where he is being held without bond, for the murder of this man, odin lloyd. Prosecutors say hernandez shot and killed lloyd in the early HOURS OF JUNE 17th. While they say they have evidence linking him to the crime, what they don't have is the murder weapon. Earlier this week, police divers were searching for evidence in this lake near hernandez's home. Divers are expected to be in water again today. None of that seems to faze hernandez, who writes in the letter, I know there is a reason I'm going through this. And I will figure it out through my relationship with the lord. The fan who received the letter, it was response to a letter he sent the football star in jail. This morning, hernandez may not agree. The letter had a clear request to, quote, keep this off social media, please. Something the fan clearly did not do. John, thank you. Dan abrams back with us again. People watching our sister station, espn, transfixed by all of this yesterday. Your opinion, legally. Bad idea for aaron hernandez to write this letter if he did? When they say anything can and will be used against you in a court of law. It's real. Anything can and will be used against you in a court of law. With that said, there's nothing specifically in this letter that's incriminating that would lead prosecutors to say, aha. Often, you're looking for inconsistent statements between one time or another. He doesn't address any of the specifics in the case, the ballistics, any of the crucial evidence. When he ends it with, please keep this off social media, it shows him how clueless he is. You're surprised that counsel didn't counsel against responding to letters. You know, if counsel was going to be advising on this, counsel would have said, write something like this. Right? Basically just, I'm not guilty. Thank you for your support. I really appreciate it. Can't wait to get back to my life, et cetera. Aaron hernandez is in big trouble. Either he is putting on a good face for the public or he's deluding himself about his future here. This letter seems to suggest he's going to be out soon. And officials will be searching that lake again today. Dan abrams, thanks for that.

This transcript has been automatically generated and may not be 100% accurate.

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